Created
February 3, 2016 21:30
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meta.rb
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| module Animal | |
| def teach_all(technique, &block) | |
| puts "Teaching All #{self.name} the command #{technique}" | |
| define_method technique, block | |
| end | |
| def unteach_all(technique) | |
| puts "Teaching All #{self.name} the command #{technique}" | |
| remove_method technique | |
| end | |
| end | |
| class Dog | |
| extend Animal | |
| attr_accessor :name, :type | |
| def initialize(name) | |
| @name = name | |
| puts "Whooof!! Whooof!! this is #{name} I'm your #{type} dog please teach me!" | |
| end | |
| def teach(technique, command) | |
| puts "Teaching #{self.name} the command #{technique}" | |
| instance_eval <<-EOS, __FILE__, __LINE__ +1 | |
| def #{technique} | |
| puts "#{command.call("#{technique}",self.name)}" | |
| end | |
| EOS | |
| end | |
| def unteach(technique) | |
| puts "Master I'm #{self.name} I'm losing my #{technique} technique" | |
| instance_eval <<-EOS, __FILE__, __LINE__ +1 | |
| undef #{technique} | |
| EOS | |
| end | |
| def method_missing(m, *args, &blck) | |
| puts "#{m} #{self.name}" | |
| puts " I don't know how to #{m} please teach me!" | |
| end | |
| end | |
| #Specific types of | |
| class GoldenRetriever < Dog | |
| def initialize(name) | |
| @type = "golden" | |
| super(name) | |
| end | |
| end | |
| class German < Dog | |
| def initialize(name) | |
| @type = "german" | |
| super(name) | |
| end | |
| end | |
| class Rotwieler < Dog | |
| def initialize(name) | |
| @type = "rot" | |
| super(name) | |
| end | |
| end | |
| ## Main method | |
| bella = GoldenRetriever.new("bella") | |
| ceaser = German.new("ceaser") | |
| viky = GoldenRetriever.new("viky") | |
| command = lambda{ |technique, name| technique + " " + name + "\n Whoooffff! I can #{technique}"} | |
| #teaching all golden retrievers | |
| teach_all_commands = ["sit", "fetch"] | |
| teach_all_commands.each do |cmd| | |
| GoldenRetriever.teach_all(cmd) do puts "#{cmd} " + self.name + "\n Whoooffff! I can #{cmd}" end | |
| end | |
| #teach specific dogs | |
| bella.teach("stay", command) | |
| ceaser.teach("stay", command) | |
| bella.sit | |
| bella.stay | |
| bella.fetch | |
| ceaser.sit | |
| ceaser.stay | |
| ceaser.fetch | |
| viky.sit | |
| viky.stay | |
| viky.fetch |
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